Keyboard



FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken line showing of various features of the keyboard in the figures is for environmental purposes and forms no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 